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Transportation..Anchorage to Whittier, and car rental or train in Skagway

After searching this topic, decided to try for more input. We'll be in Anchorage for 2 days then catching a cruise ship in Whittier, going to Vancouver. First day in Anchorage we're doing a floatseeing tour of Denali. The second day the ship doesn't leave Whittier until 9 at night, so we'll have some time to explore. Would it be preferable to rent a car from Anchorage to Whittier, or take the train?
Also, have the same question about Skagway....we want to do the White Pass, Emerald Lake trip, and are undecided about a car rental or the train.
Thanks!